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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a1741c28a5a1224258f356c91d16beb0a27ec4cae0b3670eb8c1671aacd010' 
  AND token = 'z7tJO8JTByzoCZpa6jkroujVCxHV8s9G26nh+gLsr7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}